Cam mechanism



July 4, 1950 UEBMANN 2,513,337

CAM MECHANISM Filed March 25, 1946 11v ENTOR.

A T TOE/VEYS Patented July '4, 1950 I, 2, 3,337, I oAM MECHANISM: HugoILiebmann, Union, N'. J..,,,assignor .to Aineri-l can (Jan Company, New York,

tion of New Jersey N'."Y., acorpora- Application March 25, 19.46;,3Sf91i2LlN0. 656,922

An "object, of.v the. invention is the provision of racam mechanism wherein a,.-rapi'd-and' abrupt controlled cam movement, which permits of a long stroke in a short angle, may be had without jamming and locking the cam.

Another object is the provision of such a cam mechanism wherein such a controlled cam movement is effected through an interrupted track and an element movable between the ends of the interrupted track for transferring a cam. roller rapidly from one end of the track to the other.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

Referring to the drawings:

Figure 1 is a side view of a cam mechanism embodying the instant invention;

Fig. 2 is a view similar to Fig. 1 and showing certain of the movable parts in a different position; and

Fig. 3 is a plan sectional view taken substantially along the broken line 33 in Fig. 1.

As a preferred embodiment of the instant invention the drawings illustrate a cam mechanism which includes a cam or cam disc H which may form a part of a more elaborate mechanism or machine. The cam may be of the rotatable type or of the stationary type, the invention being equally well adapted to both types of cams. A shaft I2 is provided as a support for the cam.

The cam H is formed with a single interrupted cam groove or track l4 for a cam roller l5 having a support pin l6 which may be a portion of a machine part to be actuated. The ends of the interrupted cam track may be in any desired spaced relation, depending upon the shape of the track. These ends of the interrupted cam track are cut across by a dovetail shaped slideway l8 formed in the cam II and which extends transversely of the cam.

The slideway l8 carries a dovetail slide or moveable element 2|. This slide is formed with a short cam groove or track 22 which matches the track M in the cam. The slide is adapted to be shifted along its slideway l8 from one terminal end of the interrupted track M to the 2 Claims. (01. 7.4'567) 21 other. t,erminal ..end. to bring 'its-'track,,,22 into alignment. with. either of the ends. of. the. track I 4.

Movementof," the slide. 21 is .efiected-prefe'rably. by an actuating, lever, 25.; Thelleverwis .mounted ,on a.-pivot;stud 26.. Th'isgstud'maybe threadedly secured in the cam I, as for example by way of a lug extension 21, so that it will rotate with the cam if the cam is of the rotatable type. If the cam is of the stationary type the pivot stud may be secured in a port adjacent the cam if desired.

The inner end of the actuating lever 25 carries a pin 29 which operates in a slot 3| formed in the back of the slide 2|. A clearance opening 32 formed in the back of the cam is provided for this purpose. The outer end of the actuating lever extends beyond the cam and carries a pin 33 for attachment to a suitable operating link, cam roller, or other movable machine part adapted to rock the lever 25 on its pivot stud 2B.

In operation, the actuating lever 25 holds the slide 2| adjacent the exit end of the cam track M, the track 22 of the slide being in alignment with the track [4. As the cam roller l5 While traversing the cam track I4, comes adjacent the exit end of this track, it continues along its path of travel uninterruptedly and enters the short cam track 22 in the slide 2|. While the roller is moving along this short track in the slide and as soon as it is clear of the exit terminal end of the track I4, the slide shifts along its slideway l8 until its cam track 22 is in alignment with the entrance end of the track I4.

Hence as the roller l5 continues to move along the track 22 of the slide it leaves the slide track by way of the exit end and continues on into the entrance end of the track I4 without any interruption, going immediately into another cycle. While the roller is traversing the track M the slide 2| returns to its original position with its track 22 in alignment with the exit end of the track M to receive again the roller l5 when it reaches the exit end of the track.

In this manner, continuous controlled travel of the cam roller I5 is obtained, while efiecting a rapid, abrupt change in its path of travel. With such a construction of cam mechanism a long stroke in an exceedingly short angular travel of the roller may be readily had Without locking the cam roller against movement.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form,

construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described bein merely a preferred embodiment thereof.

I claim:

1. A cam mechanism comprising a cam disc having an interrupted track for a cam roller said track being formed in the face thereof and the ends of the track being difierently spaced from the center of said cam disc, a slide element movable between the ends of said interrupted track I for transferring the cam roller from one end of,

the track to the other to effect a rapid and abrupt controlled cam movement of the roller, and an actuating lever disposed adjacent saidcam and connecting with said slide element for shifting said slide element. l

2. A cam mechanism comprising a cam having an interruptedtrack ior a cam roller the ends of said track being offset from i one another, said cam also having a slideway extending transversely of the track and interposed between the offset ends thereof, said slidewayhaving opposed side walls formed as arcs of a circ1e,'a slide element having corresponding arc shaped side walls for r 4 sliding engagement with the side walls of said slideway, said slide element also having a short track matching said cam track for the reception of the cam roller when the roller comes adjacent said element, and an actuating lever connecting with said slide element for moving it and its short c ted at the center of the arcs of said slideway "walls and said slide element walls to alternately l0.

the two ends of said interrupted track for transferring the cam roller from one end of the track align the short track of said slide element with g to its other ofiset end to effect a rapid and abrupt controlled cam movement of the roller.

HUGO LIEBMAN N.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PA ENTS Date a 1 Number Name r 1,463,839 Raahe Aug. 7,- 1923 1,814,757 Lucas July 14, 1931 2,357,501 Carnahan Sept. 5, 1944 

